SURPRISE GUESTS LIGHT UP HALL H

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People camped out, slept on concrete, ate nothing but Doritos and Mountain Dew — all in an effort to get into Hall H on Saturday at Comic-Con.

It was probably all worth it: The day kicked off with a Warner Bros. and Legendary Pictures showcase filled with big-name stars, exclusive clips and a major announcement.

For the next Superman movie, director Zack Snyder announced that the superhero will team up with Batman. Bam! Pow! Zow! The announcement caused one of the loudest fan reactions in Hall H history.

Here are the other highlights:

“Edge of Tomorrow” (June 6, 2014, release): In the biggest surprise celebrity appearance of the morning — perhaps even the weekend — actor Tom Cruise showed up to promote his latest film, about a soldier fighting in a war against aliens.

The actor entered the room and immediately began bantering with moderator Chris Hardwick. The two began singing a “Journey” song together. He then pointed out that fellow actor Bill Paxton was sitting in the audience and asked him to shower co-star Emily Blunt with compliments.

He was also enthusiastic about being at the convention.

“This is awesome,” Cruise said to a fan dressed in a cape and mask. “I’ve been waiting to see a lot of characters here.”

“Gravity” (Oct. 4): Mexican director Alfonso Cuaron brought highly intense footage of his film, which is about two astronauts trapped in space. The movie stars just George Clooney and Sandra Bullock, but only Bullock showed up.

The actress — making her Comic-Con debut — was easygoing and comfortable bantering with fans. She even told one guy in a cape and mask that he had a sexy voice.

Bullock discussed the difficulty of acting in a confined, robotic space suit with cameras flying toward her face at all times. It was a role that was challenging mentally — since she admitted she’s afraid of heights — and physically.

“Godzilla” (May 16, 2014): Last year, director Gareth Edwards showed a super short “mood piece” of a movie he hadn’t even started shooting.

This year, now that he has some film recorded, he returned with a menacing clip that showed a ravaged city along with a very quick glimpse of the terrifying lizard.

“Godzilla was always my favorite monster when I was young because he was unapologetic,” said Bryan Cranston, who stars in the film.

‘Hunger Games’ stars finally make it to Hall H

“The Hunger Games” reaches a similar fan base as the “Twilight” franchise but never got the Hall H treatment, until Saturday.

It opened with footage of the film that was so new, the actors said they hadn’t even seen it.

Though the mood in the hall was more subdued than expected, the actors happily discussed the latest adventures of Katniss Everdeen.

At first, Lawrence admitted, she wasn’t too comfortable playing a girl that lived in such an unfamiliar world, but said she’s warming to the role.

“In a weird way, it becomes a part of you, even though it’s so unlike you,” she said.

‘X-Men’ stars of future, past show up for panel

When “The Avengers” had its Comic-Con panel a few years ago, all of its star-studded cast (including Robert Downey Jr. and Scarlett Johansson) came to Hall H. It was one of the most memorable moments in the history of the convention.

20th Century Fox one-upped itself this year with the “X-Men Days of Future Past” presentation.

Though they weren’t allowed to discuss many plot points, the actors nonetheless answered questions from fans who were beside themselves with glee.

“Every second sitting out in the wet grass, it was worth it,” said a fan.

It was worth the many hours in line to see Sir McKellen joke to Fassbender about finding a husband, or hear Jackman do an Australian chant with a fellow Australian fan and improvise lines for an imaginary “Wolverine The Musical” movie.

Before the surprise star attack, Jackman shared clips of the upcoming “Wolverine” movie (due out Friday), saying to fans: “You’ll understand way more about the character than you’ve ever seen before.”